In JWE 1, you could sell unwanted dinosaurs. Often in the campaign, once I unlock a lot of stuff I like to restart some of the locations but not having any way to get rid of unwanted dinosaurs makes the game frustrating. I know there is an option to rewild dinosaurs; however, there are many dinosaurs that you can't rewild so you can try to get a large carnivore to eat them but that doesn't always work so your only option is to wait for them to die of old age currently.
For flavor, my suggestion is once you unlock the dinosaur marketplace you get the ability to sell dinosaurs once you have a marketplace built in a given location. This gives the player more control over their parks.
Great game so far, keep up the good work.